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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <orcus/sax_ns_parser.hpp>
#include <orcus/xml_namespace.hpp>
#include <orcus/base64.hpp>
#include "mso/encryption_info.hpp"
#define ORCUS_DEBUG_MSO_ENCRYPTION_INFO 1
#if ORCUS_DEBUG_MSO_ENCRYPTION_INFO
#include <iostream>
#endif
#include <vector>
#include <ostream>
using namespace std;
namespace orcus { namespace mso {
namespace {
const xmlns_id_t NS_mso_encryption = "http://schemas.microsoft.com/office/2006/encryption";
const xmlns_id_t NS_mso_password = "http://schemas.microsoft.com/office/2006/keyEncryptor/password";
const xmlns_id_t NS_mso_all[] = {
NS_mso_encryption,
NS_mso_password,
nullptr
};
class char_printer
{
ostream& m_os;
public:
char_printer(ostream& os) : m_os(os) {}
void operator() (const char c) const
{
short v = c;
v &= 0x00FF;
m_os << hex << uppercase;
if (v < 16)
m_os << '0';
m_os << v << ' ';
}
};
void print_base64(const char* caption, std::string_view base64)
{
cout << caption << " (base64): " << base64 << endl;
vector<uint8_t> value = orcus::decode_from_base64(base64);
cout << caption << " (binary): ";
for_each(value.begin(), value.end(), char_printer(cout));
cout << endl;
}
class key_data_attr_handler
{
public:
void operator() (const sax_ns_parser_attribute& attr)
{
if (attr.ns != NS_mso_encryption)
// wrong namespace
return;
if (attr.name == "saltSize")
cout << "salt size: " << attr.value << endl;
else if (attr.name == "blockSize")
cout << "block size: " << attr.value << endl;
else if (attr.name == "keyBits")
cout << "key bits: " << attr.value << endl;
else if (attr.name == "hashSize")
cout << "hash size: " << attr.value << endl;
else if (attr.name == "cipherAlgorithm")
cout << "cipher algorithm: " << attr.value << endl;
else if (attr.name == "cipherChaining")
cout << "cipher chaining: " << attr.value << endl;
else if (attr.name == "hashAlgorithm")
cout << "hash algorithm: " << attr.value << endl;
else if (attr.name == "saltValue")
print_base64("salt value", attr.value);
}
};
class data_integrity_attr_handler
{
public:
void operator() (const sax_ns_parser_attribute& attr)
{
if (attr.ns != NS_mso_encryption)
// wrong namespace
return;
if (attr.name == "encryptedHmacKey")
print_base64("encrypted HMAC key", attr.value);
else if (attr.name == "encryptedHmacValue")
print_base64("encrypted HMAC value", attr.value);
}
};
class password_encrypted_key_attr_handler
{
public:
void operator() (const sax_ns_parser_attribute& attr)
{
if (attr.ns != NS_mso_encryption)
// wrong namespace
return;
if (attr.name == "spinCount")
cout << "spin count: " << attr.value << endl;
else if (attr.name == "saltSize")
cout << "salt size: " << attr.value << endl;
else if (attr.name == "blockSize")
cout << "block size: " << attr.value << endl;
else if (attr.name == "keyBits")
cout << "key bits: " << attr.value << endl;
else if (attr.name == "hashSize")
cout << "hash size: " << attr.value << endl;
else if (attr.name == "cipherAlgorithm")
cout << "cipher algorithm: " << attr.value << endl;
else if (attr.name == "cipherChaining")
cout << "cipher chaining: " << attr.value << endl;
else if (attr.name == "hashAlgorithm")
cout << "hash algorithm: " << attr.value << endl;
else if (attr.name == "saltValue")
print_base64("salt value", attr.value);
else if (attr.name == "encryptedVerifierHashInput")
print_base64("encrypted verifier hash input", attr.value);
else if (attr.name == "encryptedVerifierHashValue")
print_base64("encrypted verifier hash value", attr.value);
else if (attr.name == "encryptedKeyValue")
print_base64("encrypted key value", attr.value);
}
};
class sax_handler
{
vector<sax_ns_parser_attribute> m_attrs;
public:
sax_handler(xmlns_context& /*ns_cxt*/) {}
void doctype(const sax::doctype_declaration&) {}
void start_declaration(std::string_view) {}
void end_declaration(std::string_view) {}
void attribute(std::string_view, std::string_view) {}
void attribute(const sax_ns_parser_attribute& attr)
{
m_attrs.push_back(attr);
}
void characters(std::string_view, bool) {}
void start_element(const sax_ns_parser_element& elem)
{
if (elem.ns == NS_mso_encryption)
{
if (elem.name == "keyData")
{
cout << "--- key data" << endl;
key_data_attr_handler func;
for_each(m_attrs.begin(), m_attrs.end(), func);
}
else if (elem.name == "dataIntegrity")
{
cout << "--- data integrity" << endl;
data_integrity_attr_handler func;
for_each(m_attrs.begin(), m_attrs.end(), func);
}
}
else if (elem.ns == NS_mso_password)
{
if (elem.name == "encryptedKey")
{
cout << "--- encrypted key" << endl;
password_encrypted_key_attr_handler func;
for_each(m_attrs.begin(), m_attrs.end(), func);
}
}
m_attrs.clear();
}
void end_element(const sax_ns_parser_element&) {}
};
}
struct encryption_info_reader_impl
{
orcus::xmlns_repository m_ns_repo;
encryption_info_reader_impl()
{
m_ns_repo.add_predefined_values(NS_mso_all);
}
};
encryption_info_reader::encryption_info_reader() :
mp_impl(new encryption_info_reader_impl) {}
encryption_info_reader::~encryption_info_reader()
{
delete mp_impl;
}
void encryption_info_reader::read(const char* p, size_t n)
{
#if ORCUS_DEBUG_MSO_ENCRYPTION_INFO
cout << "encryption_info_reader::read: stream size=" << n << endl;
#endif
orcus::xmlns_context cxt = mp_impl->m_ns_repo.create_context();
sax_handler hdl(cxt);
orcus::sax_ns_parser<sax_handler> parser({p, n}, cxt, hdl);
parser.parse();
}
}}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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